Spring-coiling machine



June 12, 1928.

L. E. DES COMBES SPRING COILING MACH INE 7 Filed Jan. 14, 1926 4Sheets-Sheet 1 .lllllllll EEEEEEEW i I e Lzoyi l fl L. E. DES COMBESSPRING COILING MACHINE June 12, 1928.

Filed.Jan. 14, 1926 4 Sheets-Sheet 5 ive I". l y w fl 0 5? June 12,1928. 1,673,185

L. E. DES COMBES SPRING COILING MACHINE Filed Jan. 14, 1926 4Sheets-Sheet 4 Patented June 12, 1928.

nnrreo STATES 1,673,185 PATENT OFFICE...

LLOYD E. DES commas, or SPRINGFIELD, oH:ro, A'ssIGNoR r INTERNATIONALHAR- vnstrnn COMPANY, A CORPORATION OF NEW JERSEY.

SPRING-COILING MACHINE.

Application filed January 14, 1926. erial l lo. 8 1 ,1 G9

This invention relates to machines for forming coils in spring members.a

, In the preferred embodiment hereinafter disclosed there is iilustratedav machine. of this type which is seini-a'uton'iatic and is adapted toform spring teeth such as commonly employed in connection with theraking cylinders of hay rakes and hay loaders.

It is an object of this invention to provide a machine. of the kindspecified which will operate efliciently for the purpose intended.

It is a further object to provide a machine which will simultaneouslyform two spring members, thereby materially speeding up production. v

Another object is to provide an improved mandrel for forming coils inthe spring.

Other objects should be apparent to anyone skilled in this art as thedescription hereof progresses.

Briefly these objects are accomplished in the provision of a machinecomprising a frame having a mandrel carrying or coiling shaft journaledtherein.- said shaft adapted to be rotated forwardly a predeterminednumber of rotations by a novel form of driving mechanism, the shaft thenbeing reverse, ly rotated to a predetermined position for the purpose ofloosening the coil which has been formed by the forward rotation of theshaft and also to have the mandrel in enact position for starting andthen to hold said shaft idle for a predetermined interval of time topermit the operators working on the machine to remove the finishedspring from a novel form of mandrel carried by said shaft before theshaft is again forwardly rotated to form the next spring member. Meansis also provided for imposing a. braking action upon the mandrelcarrying shaft to overcome its momentum just before it is reversed andagain at the instant, or just prior to the time, it. is completelystopped.

Reference is made to the accompanying sheets of drawings wherein likecharacters of reference denote like parts throughout the views, and inthese drawings,-

Fig. 1 is a side view of the machine, partly in section. as viewed alongthe line l--l of Fig. 2; 7

Fig. is a plan view of the machine;

Fig. 3 is a front view;

Fig. d is a sectional view of clutch utilized in this machine as viewedalong the line t4 of Fig. 5;

Fig. 5 is a sectional View of the same clutch when viewed at rightangles to the View shown inQFig, 4; I

Fig.6 is a detail side View of the brake and the means foroperating thebrake to impose a frictional drag on the mandrel carrying shaft Fig. 7is a detail plan view of the bracket which adj ustably supports asupplen'ientary mandrel shaft for holding the legs of a sprmgtooth beingformed on the mandrel shaft, as Viewed along the line 77 of Fig. 3; v

Fig. 8 is a detail view showing the mechanism which cooperates with acam on the main mandrel shaft to keep the same from rotating at,predetermined times, as when a finished spring is to be removed from themandrels;

Fig. 9 is a detail view showing the mannor of positioning a preformedmember on the mandrel With the legs thereof held by the supplementaryshaft to form the same into a finished rake spring tooth;.

Fig. 10 is a sectional view showing an illustrative form of the improvedmandrel utilized in the present. machine;

Fig. 11 is a sectional view of the mandrel carried on the supplementaryor leg holding shaft;

Fig. 12 is a plan View of the member which must be preformed, as shown,and generally in the shape of a U, before the same can be coiled intothe finished spring rake tooth; i

Fig. 13 is a side view of the same member;

Fig. 14 is a plan view of the member shown in Figs. 12 and 13 after thesame has been coiled intermediately of its ends to form the finishedraking tooth; and

Fig. 15 is a side view of the same finished spring tooth.

The improved spring coiling machine comprises a main frame carried on abase 21. Journaled in the frame is a driven shaft 22, carrying adjacentone end a pinion 23 and at its opposite end a pulley 24, which is beltedin a conventional manner to any usual overhead shafting employed inmachine shops. The pinion 23 meshes with a larger gear 25 keyed to ashaft 26, the shaft 26 protruding outwardly from one side of the frameand having keyed thereto at said end a pinion 27. which meshes with alarge gear 28 keyed to a shaft 29, suitably journaled in the frame ofthe machine. This shaft 29 has a cam 30 keyed thereto substantiallymidway between its ends, that is, centrally arranged in the machine,,thecam cooperating with adjacent one edge of a large quadrantal rackgear 32, said gear being formed as an extension of a bifurcated bracket33 straddling the cam 30 and roller '31 and fixed-to a two part rockshaft 34 suitably journaled in the frame of the machine. As the cam 30rotates with shaft 29 the quadrantal gear 32 will 7 rock from the dottedline position shown in Fig. 1 to the full line position shown in saidfigure, half of the cam surface acting to carry the quadrantal gear fromthe dotted line position to the full line position and the other halfacting to reverse the gear and return it to its home position as shownin dotted lines. One face of the quadrantal gear 32 has bolted thereto ablock 35 which cooperates with an adjustable cushioning member 36carried in a bracket 3'7 (see Fig.3) bolted to the machine frame for thepurpose of shortening the stroke of thequadrantal gear-and for absorbingthe shock of the gear when it is returned to its home position, as shownin dotted lines in Fig. 1, it being understood that the block 35contacts the cushioning member 36. Further to strengthen the support forthis cushioning member, there is provided on the frame another bracket38 bolted to the bracket 37 by means of a bolt 39. Adjacent the roller31 on the quadrantal gear 32 there is provided a hook 40 to which iscoupled a coil spring 41, the opposite end of which is coupled to thebase 21 by means 42 shown. The function of this spring is to impart aninitial impulse to the gear 32 when it is inits upper position to pullthe same beyond the high point on the cam 30 and to give it a good startin its homeward direction and, of course, in combination with the camtrack and roller the spring will in sure that the quadrantal gear 32will not be moved by its momentum too far in an upward direction. Thegear 32'meshes with a pinion 43 which is centrally positioned on adriven shaft 44. by means of a sleeve 45 loosely rotatable on said shaft44 (see Fig. 5). a One end of this shaft protrudes through the sideframe and carries fixedly thereon a gear 46 which mesheswith a gear 47fixed to a main mandrel carrying or coiling shaft 48, said shaft 48extending laterally through both sides of the machine for some distance.Each extended end of this shaft 48 is provided with a novel form ofcoiling mandrel to be hereinafter described.

Adjacent the pinion 43 the sleeve 45 has bolted thereto to be looselyrotatable with the sleeve 45 on the shaft 44 an internal ring member 49of a conventional form of friction clutch, said member frictionally aroller 31 carried rotatablytioned between the disk 50 and ring member 49and loosely rotatable on said eccentric with a ball bearing interposed.therebetween is a shoe 54 normally spaced from the internal face of thering member 49 but adapted to contact therewith at certain times duringthe rotation of the shaft 44 to lock the members 49 and 50 together sothat they will rotate as a unit. As shown in Fig. 4 the shoe 54 has ahooked boss 55 extending from one end, which is fastened at 56 to thering member 49 by means of the spring 57,the spring always serving toreturn the shoe to a certain predetermined position to keep the shoenormally spaced from the internalface on the member 49 and to return thesame to such position after the eccentric 53 has displaced the shoe 54to clutch the parts together.

It will be observed that'in this illustrative embodiment the length ofthe rack 32 is so proportioned that in its rocking movement from itsdown position to its upward position it will rotate the mandrel carryingshaft three times, thus forming three coils in a spring member formingon the mandrels. The stop 36 is properly adjusted to permit this rangeof movement of the quadrantal gear rack 32. Thus the coils will becompletely formed when the rack 32 is in its upward position. The cam 30with the aid of the spring 41 then reverses the movement of the rack 32to return it to its home or downward position. About a third of theperiphery of this quadrantal rack 32 is utilized to rotate the mandrelshaft once in a reverse direction for the purpose of loosening the coilson the mandrel so that the spring may be easily removed by the operatorsworking on this machine. After this shaft has reversely rotated, thispredetermined part of a turn or number of turns, the mandrel shaft isbrought to a complete stop, and this is effected by the clutch mechanismjust described and shown in Figs. 4 and 5. This is due to theparticularposition of the eccentric 53 onthe shaft 44, which at thisinstant is so positioned that the shoe 54 will'be free of the internalface on the ring member 49, which means that the sleeve 45 and pinion 43thereon will loosely rotate on the shaft 44 without driving the shaft 44and so, of course, no drive can be transmitted to the mandrel shaft 48.However, in addition to this clutch, a posi tive means has been providedwhich is timed in its operation with the clutch positively to restrainthe mandrel carrying shaft from further movement after it has reverselyrot'ated as desired, and such mechanism is furthermore effective to holdthe shaft idle This )ositive restrainin mechanism for the mandrel shaftwill now be described.

Bolted to the side face of the quadrantal gear 32 opposite from thatside which carries the block 35 is a bracket 58, one end of which hasfixed therein a laterally extending rod 59 which carries at its free enda roller 60, as shown in Figs. 1 and 2. This roller 60 cooperates with acam track 61 (in this connection see also Fig. 8), said track timescooperating with a pin 62 carried by the side frame of the machine andnormally urged toward a position contacting said pin 62 by a spring 68which is also fastened to the side frame. The cam track 61 has adjacentits forward terminal a dwell Bi and a hook portion 65 to which is lineda block 66 centrally pivoted on a pin 67 carried by the frame (see Fig.3), said block being positioned adjacent the mandrel carrying shaft e8,said shaft 48 having at thispoint a cam 68 which is adapted to cooperateat certain times with a pivoted cushioning member 69 carried by theblock 66 and normally urged toward the dog on the cam 68 by a spring 70,said cushioning member 69 being limited in its pivotal movement by meansof the hook and pin 71 shown, as will be readily understood. Thus, inthe upward swing of the quadrantal rack 32 the shaft 18 carrying themandrels will be rotated forwardly, which means in a counterclockwisedirection, as viewed in Fig. l, with the dog on the cam 68 passing infront of the block 71 and clicking past the cushioning member 69. Now asthe rack 32 starts toward its home position the roller 60 on the shaft59 will ride under the cam track 61, which act-ion of the roller 60 onthe cam track 61 tends to raise it against the pull of the spring 63 tokeep the block 71 and the cushioning member 69 thereon out of the pathof the dog on the cam 68. l/Vhen the quadrant has traveled the necessarypredetermined distance to its home position the roller 60 will pass offthe cam track 61 and into the dwell 6% thereon, which will permit thespring 63 to exert its normal tendency to pivot the block 71 in adirection to move the cushioned dog 69 into the path of movement of thecam 68, which, of course, is now rotating with the mandrel shaft in thereverse direction. Thus, the mandrel shaft must stop by this positivemeans and, of course, the clutch described and shown in Figs. 4 and 5acts at this instant to make the pinion 43 and sleeve 45 rotate looselyon the shaft 44 so that no drive can be imparted to the mandrel carryingshaft.

A braking means is also provided which automatically acts to overcomethe momentum of the mechanism at the instant that the quadrantal gear 32has reached its uppermost position, that is, in other words, at theinstant the forward rotation of the mandrel shaft has been completed andjust before it is to be reversed in its rotation. This mechanism, thatis the braking mechanism, is also active at the instant or just beforethe nstant that the cam 68 locks with the cushioned dog 69 to reduce themomentum of the parts just before the mandrel shaft is brought to astandstill. This is quite an important feature of the present invention,as it prevents considerable hammering and chattering of the parts andovercomes unnecessary strains. The front side of the frame member 20 isprovided with a cross piece 72 (see particularly Fig. 6), which carriesa bracket 73 by means of suitable bolts and in turn having arms 74 towhich is bolted a mutilated circular guard or shield 75 within which isa brake drum 76 fixed to the mandrel carrying shaft 48. The usual brakeband 77 is trained around the drum 76, one end thereof being fastened toa meniber 78 to which is pivotally connected an elongated member 7 9.said. elongated member 1n turn being pivoted on a pintle 80 and thelower end of the member 79 having the other end of the brake band fixedthereto. The pintle 80 also carries a cam shaped lever 81, the lower endof which, or the tail end of which. has fitted thereto a rod 82reciprocable through the frame piece 72 and bracket 73, as shown.Adjacent one corner of the quadrahtal gear 32 just inside of itsmarginal edges is fitted a spring pressed roller 83 which in itsdownward and upward swinging movement at certain times contacts the camlever 81, as shown in the dotted line positions 84 and 85 of the roller,to impose a frictional drag on the mandrel carrying shaft to overcomeits momentum at the proper times.

As stated, the illustrative embodiment of this invention contemplates amachine which will manufacture coil springs of a certain type such asare employed inthe raking cylinders of hay harvesting machines. Thesesprings, as shown in Figs. 12 to 15, comprise a U-shaped piece of springwire having an angular bight portion 86 which is adapted to be bolted tothe frame member of a raking cylinder, and adjacent this angular bightis a pair of opposed coils 87 the continued ends of the coils beingextended to form opposed, spaced, parallel legs 88 which serve asresilient gathering tines or teeth.

An improved mandrel has been provided for forming raking teeth of thiskind and,

as shown in Fig. 10, it comprises a tapered body piece 89 extended intoa cooperating tapered bore in each end of the mandrel shaft 18 and isdetachably locked therein by a set screw 90 so that this form of mandrelmay be easily removed and be replaced by another kind for formation ofdifferent coil springs, should occasion require. Another piece 91 abutsthe piece 89 and is coupled thereto by means of a threaded member 92which has cooperating cut out portions for locking over shoulders 93formed on said piece 91. A gear 91 iskeyed to the part 91. A bored outwinding or mandrel piece 95 is threadedly screwed to the free end of thepiece 91 and fitted thereinto, as shown. The piece95 is provided with acooperable piece 96 having a knob 97 and which piece 96 may be displacedor relatively moved with respect to the piece 95 by sliding the sameoutwardly thereacross, which will be permitted by the tapered mortiseand tenon joint 98. A coil spring 98 is fitted into the hollow of themember '95 and connects the two pieces 95 and 96 together as at 99 and100, respectively. The members 95 and 96 are respectively provided withsets of oppositely pitched coil forming corrugations 101. It will thusbe seen that the entire mandrel is readily detachable from the mandrelcarrying shaft by removal screw 90 and furthermore that the mandrel maybe easily collapsed to'permit ready removal of a finished coil springtooth.

Some means must be provided for holding the legs 88 of the spring toothbeing formed while the coils are being formed therein by the mandreljust described and such means is provided in the supplementary shaft102, which has loosely arranged thereon a pinion 103 adapted to meshwith the gear9-1 on the main mandrel. A member 104 is also loose on theshaft 102 and locked to the gear 103 by the tongue and groove joint 105shown. This member 10-; is prevented from displacement over the end ofthe sta tionary shaft 102 by a set screw and washer 1.06. The member 104is provided with oppositely pitched sets of corrugations 1.07 which arein alinement with the corrugations 101 on the main mandrel. Thissupplementary shaft. 102 with the parts carried thereby is fastened bymeans of a nut 108 to a bracket 109 secured by a belt 110 to the framemember 20 of the machine. This bracket 109 is provided with a verticallydisposed slot 111 within which the shaft 102 may be adjnstably fixed bymeans of the nut 108 to raise said shaft 102, or lower it, with respectto the main mandrel shaft. The bracket 109 is also provided with asubstantially horizontally disposed slot 112 at its lower end below thebolt 110. said bolt adapted to be loosened to pivot the entire bracket109 to move the same closer to or farther from the ators hook over theknob 97 on the main mandrel with the legs 88 positioned under theadjacent supplementary shaft 102, the legs engaging the corrugations orgrooves. The machine is then started and through the pulley 24 the shaft22 is driven, which in turn drives the shaft 26, in turn driving theshaft 29, which, of course, imparts rotation to the cam 30 and carriesthe quadrantal rack 32 from its home or down position, as shown indotted lines in Fig. 1, to swing it upwardly, the rack, of com'se,meshing with the gear 43 on the driven shaft 44 to impart rotation tothe mandrel shaft through the gearing described, said main mandrel shaftbeing rotated a predetermined number of times dependent upon the lengthof the rack 32, and in this case it being of such length that themandrels will be turned three times in a forward direction to form twosets of three coils each disposedin opposed relation and intermediatelyof the ends of the spring teeth being formed. The quadrant isnow in itsuppermost position and the roller 31 is on the high point of the cam.The continued rotation of the cam now effects a reversal of thequadrantal rack 32 and starts it back to its home position with the aidof the. impulsing spring 41, and, in the mea-ntime. as it travels backthe roller 60 controlled by the quadrant-a1 gear 232 permits the shaft14: to rotate a single turn in a reverse direction because said roller60 is exerting a force on the cam track 61 to hold the dog 69 clear ofthe cam 68. Now,however, the cam has moved about a third of its waytoward its home position and the roller 60 rides into the dwell 01 inthe cam track, allowing the spring 63 to return the cam track 61.against the pin 62 to move the block 71 in such a direction that the dog69 carried thereby will lie in the path of thecam 68, thereby stoppingthe shaft 14. This step mechanism shown in Figure 8 is made to miss thefirst reverse revolution of the mandrel shaft when necessary and catchthe second or part of the second reverse revolution, which loosens thecoils of the spring and also stops the coiling mandrels at the samepositive position for starting the next operation of coiling. At thissame time the eccentric 53 is in such a position with the shaft 141 thatthe shoe 54 cannot rotate the internal ring piece 49 with the clutchpiece 50, and the sleeve45 and pinion 43 therefore rotate idly and cannot drive the mandrel shaft. Thus, during the remainder two-thirdsmovement of the quadrantal gear to its homev position, the mandrel shaftis idle and the operators may remove the finished springs therefrom, thesingle reverse rotation having served to loosen the coil on the mandreland with the aid of the collapsible mandrel shown in Fig. 10, theoperators may easily remove the finished spring teeth and place anotherone in position before the mechanism and the mandrel shaft are againdriven in a forward direction. The mandrel shown in Fig. 10 is collapsedvery easily, the operator merely pulling it endwise so that the bight86, which is hooked over the end knob 97. Will permit the member 96 tobe displaced or moved endwise of the member 95, the spring 98 returningthe part 96 to normal position with respect to the part 95.

The braking means disclosed in Fig. 6 is operative to impart africtional drag on the mandrel shaft and the driving gearing at theinstant the quadrantal gear 32 has reached its uppermost position tolessen its momentum, and this is accomplished by the spring roller 83 onthe quadrantal gearing contacting the tail of the lever 81, as shown at85, to pull the band tight on the drum 76. The mechanism is thenreversed and at the instant it reverses or a moment thereafter theroller 83 contacts the high cam part of the lever 81, as shown at 84.again to lessen the momentum of the mechanism by imposing a frictionaldrag thereon just before the mandrel shaft is brought to a dead stop bythe cam 68 and the clutch shown in Figs. 4 and 5. As the quadrantal gearreaches its home position with the gearing which drives the mandrelshaft idle, the block 35 contacts the cushioning means 36 and preventsdamaging shocks, this cushioning member also having been properlyadjusted to limit and control the range of movement of the gear 32. Themandrels are provided with oppositely pitched corrugations to form theparticular coils 87 shown in Fig. 14, and the legs 88 travel outwardlyalong the sup plementary mandrel on the shaft 102 as the coils 87 areformed, to maintain the legs. 88 in parallel position. Also the bracket109, which carries the supplementary mandrel shaft 102, is easilyadjustable in. a plurality of directions operatively to position thissupplementary mandrel leg holding shaft with respect to the main mandrelupon which the coils are formed. Obviously the machine of this inventioncan be altered so that it can be utilized in the manufacture of springshaving any number of coils. This would be accomplished by giving thegear 32 a longer or shorter path of movement through the medium of thestop 36, and likewise, of course, relatively changing the number ofcorrugations on the mandrels and changing the gear ratios of gears 46and 47. Close coils or spaced coils can be formed easily as desired byproperly arranging the mandrel corrugations and by changing the gears103 and 94s, as will be obvious.

From the above description it will be obvious that a machine has beenprovided with which allof the objects expressed at the beginning of thespecification may be achieved. It is to be understood that thedisclosure herein is one of the preferred embodiment and that the sameis capable of modification and change in many Ways Without departingfrom the scope of this invention, as indicated in the subjoined claims.

What is claimed is:

1. In a spring coiling machine, the combination of a frame, a pair ofrotatable parallel shafts journaled in the frame, and means on the shaftfor forming a plurality of opposed coils in a spring member having apair of extended legs arranged in spaced parallel relation.

2. In a machine of the class described, the combination of a frame, acoiling shaft journaled therein, a driven shaft journaled in the frameand geared to the coiling shaft, driving means for rotating said drivenshaft and coiling shaft a plurality of times in one direction, means forreversing said driving means to give the driven shaft and coiling shafta single rotation in a reverse direction, and means for holding saidcoiling shaft stationary for a predetermined interval of time after. thecoiling shaft has rotated a. single turn in a reverse direction whilethe driving means continues in operation.

3. In a machine of the class described, the combination of a frame, acoiling shaft journaled therein, a driven shaft geared to the coilingshaft mechanism for rotating said driven shaft to turn the coiling shafta plurality of times in a forward direction, the same mechanism adaptedto rotate the driven shaft to turn the coiling shaft a predeterminednumber of revolutions or parts of a revolution in a reverse direction,and means for holding said coiling shaft idle for a predeterminedinterval of time before again rotating the coiling shaft in a forwarddirection.

4. In a machine of the class described, the combination of a frame, acoiling shaft journaled in the frame, a plurality of mandrels fixed inthe shaft. a single mechanism includinga driven shaft geared to thecoiling shaft. for rotating said coiling shaft for wardly a plurality oftimes and for a predetermined nnmber of revolutions or less than arevolution in a reverse direction, and means for holding said coilingshaft idle a predetermined interval before again rotating the coilingshaft in a forward direction.

5. In a machine of the class described, the combination of means forforming coils in spring blanks, means including a drive shaft carryinggear for operating said coiling means in. one direction to form apredetermined number of coils, the same means reversing the coilingmeans to loosen the completed coil, and means'for restraining movementof said coiling means for a predetermined interval while the'operatingmeans continues.

6. In a machine of the class described, the combination of a frame, acoiling shaft journaled therein, a drive shaft geared to the coilingshaft, a' gear for driving the drive shaft, a cam for operating the gearto turn the drive and coiling shaft-s forwardly a plurality of times,means associated with said cam for reversing the movement of the gear toturn the drive and coiling shafts in a reverse directiona predeterminedamount, and means for holding the coiling shaft stationary for apredetermined interval.

7. In a machine of the class described, the combination of a frame, amandrel shaft journaled therein, a gear for driving the mandrel shaft, acam for operating the gear to turn the mandrel shaft forwardly aplurality of times, means associated with said cam for reversing themovement of the gear to turn the mandrel shaft in a reverse directionapredetermined amount, means on the frame and cooperable with a cannonthe mandrel shaft for holding the mandrel shaft stationary for apredetermined interval, and means movable with the driving gear forcontrolling the operation of said mandrel shaft restraining means.

8. In a machine of the class described, the combination of a frame, amandrel shaft jou'rnaled therein, a rocking gear for rotating themandrel shaft a plurality of times forwardly, a cam for operating saidgear, means associated with said cam for reversing the movement of thegear to operate the shaft in a reversed direction, and an automaticallyacting braking means for imposing a drag on the mandrel shaft toovercome its momentum just before its rotation is reversed. I

9. Ina machine of the class described. the combination of a frame, amandrel: shaft journaled therein, a rocking gear for rotating themandrel shaft a plurality of times forwardly, a cam for operating saidgear, means associated with said cam for reversing the movement of thegear to operate the shaft in a reverse direction, and a brake on themandrel shaft controlled by the movement of the gear for imposing a dragon the shaft to overcome its momentum just before its rotation isreversed.

10. In a machine of the class describerhthe combination of a frame, amandrel shaft journaled therein, means for driving said shaft forwardlya plurality of rotations to form a predetermined number of coils in aspring blank on the mandrel, the same means adapted. to drive themandrel shaft reversely a predetermined amount, means for restrainingfurther rotation of the shaft after it has reversed as predetermined,andbraking means for said shaft to impose a drag thereon to overcome itsmomentum at the end of its forward rotation and again at the time itsrotation is restrained after it has reversed.

11. In a machine of the class describechthe combination of a frame, amandrel shaft journaled therein, means for driving said shaft forwardlya plurality of rotations to form a predetermined number of coils in aspring blank on the mandrel, the same means adapted to drive the mandrelshaft reversely for a predetermined rotation, means controlled by thedriving means for restraining further rotation of the shaft after it hasreversed. as predetermined, and braking means for the shaft alsocontrolled by the driving means to impose a drag on the shaft toovercome its momentum at the end of its forwardmovement and again at thetime its rotation is restrained after 1t has reversed.

12. In a machine of the class described, the combination of a frame. ashaft journaled therein, a coiling mandrel on each end of the shaft,means for rotating the shaft a plurality of times to form coils in aspring member having legs, and supplemental shafts rotatably carried inthe frame adjacent the mandrels to hold and guide the legs of the springmembers while the coils are being formed therein.

13. In a machine of the class described, the combination of a frame, ashaft journaled therein, a coiling mandrel at the end of said shaft,means for rotating the'shaft to form coilsin a spring memberintermediately of its ends and having legs, a rotatable supplementaryshaft-carried by the frame adjacent the mandrel for holding the legswhile the coils are being formed, said shaft being gearedto the firstshaft and means on said supplementary shaft for maintaining the legs ofthe spring member in parallel spaced ali gnment.

14; In a machine of the class described, the combination of a frame. ashaft journaled therein, a coiling mandrel at the end of said shaft,means for rotating the shaft to form coils in a spring memberintermediately of its ends and having legs, a supplementary rotatableshaft carried by the frame adjacent the mandrel for holding the legswhile the coils are being formed, said shaft being geared to the firstshaft, and means for adjusting said supplementary shaft on the framerelative to the mandrel shaft. 7

15. In a machine of the class described, the combination of a frame, ashaft journaled the-rein, a coiling mandrel at the end of said shaft,means for rotating the shaft to form coils in a spring memberintermediately of its ends and having legs, a snpplementary rotatableshaft carried by the frame adjacent the mandrel for holding the legsWhile the coils are being formed, said shaft being geared to the firstshaft and means for adjusting said supplementary shaft on the frame in aplurality of directions relative to the mandrel shaft.

16. In a spring coiling machine having a frame and a shaft journaledtherein, the combination of a mandrel detachably carried by the end ofsaid shaft, said mandrel embodying a slidable part. means for collapsingsaid mandrel by displacing the slidable part to assist in removing afinished spring, and means for returning the slidable part to its firstposition.

17. In a spring coiling machine having a frame and a shaft journaledtherein, the combination of a mandrel carried thereby, said mandrelcomprisii'ig two resiliently connected parts one of which is relativelymovable With respect to the other for permitting easy removal of aspring formed thereon.

18. In a spring coiling machine having a frame and a shaft jonrnaledtherein, the combination of a mandrel carried thereby, aid mandrelcomprising tWO parts one of Which is relatively movable with respect tothe other for permitting easy removal of a spring formed thereon, andmeans c0nnecting the two parts for automatically restoring the movablepart to its normal position after the spring has been removed therefrom.

19. A mandrel for coiling springs comprising a tWO part coiling member,a resilient connection between the two parts, and one of said partsbeing relatively slidablc with respect to the other.

20. A mandrel for coiling springs comprising a body, a two part coilingmember fitted to the body, one of said parts being relatively slidablewith respect to the other, and resilient means connecting the two partsleg portion of the blank to restore the movable part to its normalposition after it has been displaced.

21. In a spring coiling machine, the combination of a frame, a coilingshaft carried in the frame, means for rotating said shaft, a coilingmember on the shaft adapted to receive and coil a spring blank having anextended portion, and a rotatable member for holding said extendedportion of the blank While coils are being formed therein.

22. In a spring coiling machine, the combination of a frame, a coilingshaft carried in and extending through the frame, means for rotatingsaid shaft, a coiling member on one end of the shaft for receiving andcoiling a spring blank having an extended leg portion, a shaft forholding the said leg portion of the blank, and means for rotating theholding shaft from the coiling shaft.

23. In a spring coiling machine, the combination of a frame, a coilingshaft journaled in the frame having an end extending beyond each sideand free of the frame, means for rotating said shaft, a coiling memberon each end of the coiling shaft for receiving and coiling a springblank having an extended leg portion, and a rotatable shaft parallelvwith the coiling shaft and adjacent each coiling member for holding theleg portion of each blank.

2st. In a spring coiling machine, the combination of a frame, a pair ofshafts carried in the frame, means for rotating the shafts, and means onone of the shafts for engaging and forming coils in a spring blankhaving a leg portion, the other shaft engaging and holding the legportion of the blank during the coiling operation.

25. In a spring'coiling machine, the combination of a frame, a pair ofparallel shafts carried in the frame, means for rotating the shafts inopposite directions, and means on one of the shafts for engaging andforming coils in a spring blank having a leg portion, the other shaftengaging and holding the during the coiling operation.

In testimony whereof I affix my signature.

LLOYD E. DES COMBES.

